[PATCH v2 0/6] tracing: export event trace and trace_marker

From: Tingwei Zhang
Date: Sat Jul 25 2020 - 22:59:57 EST

Ftrace has ability to export trace packets to other destionation. Currently,
only function trace can be exported. This series extends the support to
event trace and trace_maker. STM is one possible destination to export ftrace.
Use seperate channel for each CPU to avoid mixing up packets from different
CPUs together.

Change from v1:
All changes are suggested by Steven Rostedt.
User seperate flag to control function trace, event trace and trace mark.
Allocate channels according to num_possible_cpu() dynamically.
Move ftrace_exports routines up so all ftrace can use them.

Tingwei Zhang (6):
stm class: ftrace: change dependency to TRACING
tracing: add flag to control different traces
tracing: add trace_export support for event trace
tracing: add trace_export support for trace_marker
stm class: ftrace: enable supported trace export flag
stm class: ftrace: use different channel accroding to CPU

drivers/hwtracing/stm/Kconfig | 2 +-
drivers/hwtracing/stm/ftrace.c | 6 +-
include/linux/trace.h | 7 +
kernel/trace/trace.c | 270 ++++++++++++++++++---------------
4 files changed, 158 insertions(+), 127 deletions(-)

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